V.E.R.A. -- Virtual Entity of Relevant Acronyms (February 2016):

DSI
       Defense Simulation Internet (network, mil., USA)


V.E.R.A. -- Virtual Entity of Relevant Acronyms (February 2016):

DSI
       Dial Services Interface [API] (API, IBM)


V.E.R.A. -- Virtual Entity of Relevant Acronyms (February 2016):

DSI
       Digital Speech Interpolation (VOFR)


V.E.R.A. -- Virtual Entity of Relevant Acronyms (February 2016):

DSI
       Dynamic Skeleton Interface (CORBA, ORB, OA)


V.E.R.A. -- Virtual Entity of Relevant Acronyms (February 2016):

DSI
       Dynamic Systems Initiative (MS, MCF)


The Free On-line Dictionary of Computing (30 December 2018):

Delivered Source Instruction
DSI

    (DSI) One line of source code (LOC)
   developed by a project.

   DSI is the primary input to many tools for estimating software
   cost.  The term "delivered" is generally meant to exclude
   non-delivered support software such as test drivers.  However,
   if these are developed with the same care as delivered
   software, with their own reviews, test plans, documentation,
   etc., then they should be counted.  The "source instructions"
   include all program instructions created by project personnel
   and processed into machine code by some combination of
   preprocessors, compilers, and assemblers.  It excludes
   comments and unmodified utility software.  It includes job
   control language, format statements, and data declarations.

   (1996-05-29)